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H. F. STONE.

GRINDING MILL. l No. 397,445. Patented Feb. 5, 1889.

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GRINDING MILL No. 397,445. Patented Feb. 5, 1889.

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'Nrrn STATES arent trice.

HERBERT E. STONE, OF APPLETON, lVISCONSIN, ASSIGNOR lO 'llIE APPIJETONNAN UFAOTURING (,OM'PAN Y., Ol" SAME PLACE.

GRINDINGHiVlILL..

SPECIFICATION forming part of Letters Patent No. 397,445, dated February5, 1889. Application filed November 19, 1887. Serial No. 255,658. (Nomodel.)

To LZZ whom, may concern.:

IIe it known that I, HERBERT I?. STONE, a citizen of the United States,residing at Appl eton, in the county of. Outagamie, in the State ofVvvisconsin,haveiuventedacertain new and useful Improvement inGrinding-iliills, which I desire to protect hy Letters Patent of theUnited States, and of' which the 'following is a specification.

The object of my invention isto improve in grinding-mills iu the Yfirstor preparatory re-V duction of the material before reaching the burrs orgrinding-disks. It has been the custom, as a prelmratory reduction ofthe material, (corn in the ear, Af'or example,) to subject it to acutting or breaking operation only before the final reduction by theburrs or disks. This proves unsatisfactory, as by suoli means Athematerial is not suliicieutly reduced to properly enter the disks.

I have as an important .feature of my invention applied intermediatereducing mechanism that fully obviates the difficulty named.

Other features, hereinafter set forth, also enter into my improvements.

In the accompanying drawings, making a part of this specification,'Figure l is a plan view with some of the upper portions of the millremoved. Fig. 2 is an end elevation. Fig. 3 is a perspective of therevolving grinding-disk. Fig. t is a perspective of the stationarygrinding-disk. Fig. 5 shows the grinding mechanism in elevation.Fig. is a vertical section centrally through the grinding mechanism withpart of the shaft shown in elevation. lfigs. 7 and S are details ofdisk.- adjusting mechanism.

The general construction of the machine does not differ materially frompriormills. A supporting part, A, casing l". for the grim'lingmechanism, a shaft, C, suitably supported to extend throughv the eye ofthe stationarydisk D and serve as a bearing for the rotary disk E, maybe of usual construction.

The more importantimprovements in vol ved in this application have theirfoundation in a hub, a, cast. in the present example integral with thedisk E, or rather the supporting Structure E of the revolving disk.'.lhc hub a., as shown in Fig. 6, when the disks or hurrs are inposition, extends through the eye of `from the recesses i is Inievented.

the stationary disk. Upon this hub, or this portion thereof, aresecured, by screws or otherwise, corrugated or roughened plates I). Theend of hub u. has integral therewith flan ges c, 'd that l ear a spiralrelation as to position with the axial line of the hub.

A plate, d, is secured to the supportingplate I) oif the stationarygrinding-disk. llate is flanged, the flange beingl adapted to be securedin the inside of.' plate l', against which flange disk I.) is bolted,whereby said plate is permanently secured. The sem ieircular-plate (l isdesigned in horizontal breadi h to equal the width of plates h, and alsoto reach, or approximatelyy so, the inner edges of the tlangcs c, and iscorrugated or roughened to furnish proper grinding or reducing surface.The corrugated upper semicircular plate, d', is integral with plate I),and is de signed as auxiliary to plate d. The proximity of plates d d toplates l) is such that they may operate mnljointly for the reduction ofthe material. Plates to facilitate the ingress of feed, are madetapering-that is,

` they areiucreased in thickness in the direction opposite to rotation',as ilnlieated in section, Fig-.15. The first stage in the reduction ofthe material is effected by means of the knives e. The latter are boltedor otherwise secured iipon a hub ptntioii, e', that has tenenprojeetimis adapted to be seated in recesses i in the adjacent end ofhub u., by which rotation of said knives is insured. 'lbe outer ends ofknives e and hub eare in proximityio a wall, n, of the `mill structure,and thus uncouplingI Shaft (l, and consequently the other rotatableparts, has motion imparted to it by means of the pulley H.

It is obvious that the form of the knives may be varied, or otherdevices may be sub-- stitutei'l for the knives in the preliminaryoperation, the purpose of which is to break, cut, or otherwise reducethe material to lit it for the .first grinding.

In liig. i' is shown achute, G, through which the ear-corn or thematerial u n fit forinnnediate reception by the grindingdisks isintroduced to the knives, which, after undergoing reduction by thelatter, is, owing to their spiral relation to the axis of motion,carried to the TOO spiral flanges c, and by the latter fed to thegrinders h and d d as the next stage in the process.

It will be noted that the plates AI) are broader 1 at one end than atthe other, their sides being curved or cut to follow the spiralconfiguration of the curved conveyer-flanges ci; and hence said platesY) form a part of the conveyer, and the grinding operation takes placeat the same time that the .material is being urged forward by theconveyer-iianges. As soon as the material reaches the grindingplates bthe reduction commences, and the material is so far reduced before itleaves the plates l) as to pass readily through the eye of thestationary disk without clogging or choking. This intermediate grindingis essential to the successful operation of this class of machines, aswithout it the material will choke or clog the eye of thedisk and willnot pass to the grinding-space between the disks. The material is thenin position to be operated upon by the grinding-disks and the operationof reduction thus completed.

I do not claim the knife accessories, as such appliances are notnew inconnection with feed-mills.

The shaft C, upon which all the rotatable parts are supported, is adjusted longitudinally by means of a hand-wheel, I, the auxiliarymechanism being shown in Figs. 7 and S. A suitable box, F, is formed atthe end or extension of the structure contiguous to the end of shaft C,having a screw-threaded bore at its outer end into which inserted athreaded sleeve, il., upon the end of which. the handwheel l ismounted.lVithin box F, surrounding sleeve yu,is placed a spiral spring, f.Sleeve yu has an angularbore, as shown in Fig. 8, into which extends ashaft, 0*, correspon ding in cross-section to the bore of the sleeve toinsure turning of the latter, but sufficiently loose to admit oflongitudinal movement.

On the projecting end of shaft vr is a head, s, that bears against afollower, w, which in turn has a bearing against the end of shaft C. Theinner end of spring t bears against head s, and its outer end againstthe end wall of the recess of box F. The immediate'force or pressureagainst shaft C is derived from the interposed spring t.

Sleeve u, by means of hand-wheel I, may be adj usted so that any desireddistance between head s and the adjacent end of the sleeve may beobtained. This distance is the amount of longitudinal play allowed toshaft C under the yielding pressure of spring t, and consequently limitsthe distance through which the grinding-disks may separate. Thespringpressure is designed to be sufficient to keep the disks in properrelation to each other under normal conditions of grinding; but in theevent of accidental admission of refractory material a yielding isadmitted between the head s and end of the sleeve aforesaid. To

prevent shaft t from being forced out of its seat in the sleeve by theaction of the spring in the event of detaching the parts, said shaft isreduced and screw-threaded at its outer end and nuts r applied, whichlatter abut against the end of the sleeve. y

The periphery of wheel l is notched, as a part of the provision forpreventing its accidental movement, and beneath to the structure ispivoted a lever, V, adapted to engage with the notches at one end, andso weighted at its opposite end, q, that gravitation will serve to holdthe other end in contact with the wheel.

Hopper B over the grinding-disks is designed for use when preparatoryreduct-ion of the material is unnecessary.

I do not design that my improvement with relation to grinding shall belimited to the specific devices shown for the intermediate part of theoperation, as modifications maybe substituted without departing from thei11- vention.

Having described my invention, what I claim, and desire to protect byLetters Patent, is-

ln grimling-mills, the combination of disks D and E, rotatable hub a,provided with plates b, stationary plates d d', conveyer-flanges c, andknives e, all arranged to operate substantially in the manner set forth.

HERBERT F. STONE. [L s] In presence of A. B. WHiTMAN, W. W'. mecs.

